This collection documents the development of urban infrastructures from the perspective of private and public health care, and looks at the role of private enterprise, the municipalisation of networks, and the part engineers play in this development. The authors provide a new take on history and urban archaeology over the course of this journey, which covers three centuries, taking us down into the depths of the city, from the past to the present. French version only. Sous la direction de Louise Pothier. Groupe PGV, diffusion de l'archéologie (Collection Mémoires vives), Pointe-à-Callière, cité d'archéologie et d'histoire de Montréal et Groupe PGV, 1996, 84 pages.